Imperialism By History1900 Period: Dec 1, 1823 to Aug 1, 1914 Imperialism Dec 2, 1823 James Monroe sent a message to congress creating the monroe Doctrine Jan 1, 1898 violence in Havana led U.S. authorities to order the battleship USS Maine to the city’s port to protect American citizens Feb 15, 1898 USS maine was sunk by spain, killed 260 americans Apr 19, 1898 The Teller Amendment was passed by the senate. Apr 25, 1898 americans declared war on spain, Spanish American War began, Americans fought for the cubans against spain to gain Cuba’s independence May 1, 1898 Dewey led a us navy squadron into Manila Bay and destroyed the anchored spanish fleet Jul 3, 1898 the spanish fleet was destroyed off santiago by the us Jul 17, 1898 the war ended Aug 12, 1898 an armistice was signed between spain and the us Dec 10, 1898 Treaty of Paris Apr 11, 1900 The Foraker Act was approved by congress Sep 1, 1901 mckinley was assassinated by Leon Czolgosz who shot him two times in the chest Sep 1, 1901 Teddy Roosevelt became president after William Mckinley was assassinated. May 4, 1904 May 4,1904- A ceremony occurred to officially start the Panama Canal Project. Aug 15, 1914 The Panama Canal opened.